Where does “fynf” come from?

fynf (Crimean Gothic) comes from Proto-Germanic fimf, from Proto-Indo-European pénkʷe — five.

Ancestry of “fynf”, step by step

StepLanguageWordMeaning
1Proto-Germanicfimffive
2Proto-Indo-Europeanpénkʷefive
Every word from Proto-Indo-European pénkʷe →Every word from Proto-Germanic fimf →
fynf — Etymology, Origin & Word History | Etymology Explorer